#! /usr/bin/env python

"""usage: ttroundtrip [options] font1 ... fontN

    Dump each TT/OT font as a TTX file, compile again to TTF or OTF
    and dump again. Then do a diff on the two TTX files. Append problems
    and diffs to a file called "report.txt" in the current directory.
    This is only for testing FontTools/TTX, the resulting files are
    deleted afterwards.

    This tool supports some of ttdump's command line options (-i, -t
    and -x) and they will in fact be passed to ttdump. Specifying -t
    or -x implies ttcompile -i <originalfile> on the way back.

    Normally all output from ttdump and ttcompile is suppressed,
    -v (verbose) causes it to be shown.
"""

import sys
import os
import tempfile
import getopt


class Error(Exception): pass


def usage():
	print __doc__
	sys.exit(2)


def doCommand(cmd, verbose=1, okresult=None):
	print "--> ", cmd
	output = os.popen(cmd, "r", 1)
	lines = []
	while 1:
		line = output.readline()
		if not line:
			break
		if verbose:
			sys.stdout.write(line)
		lines.append(line)
	result = os.wait()[1] >> 8
	if result and result <> okresult:
		raise Error, result
	return "".join(lines)


try:
	options, args = getopt.getopt(sys.argv[1:], "it:x:v")
except getopt.GetoptError:
	usage()

if not args:
	usage()

dumpOptions = []
compileWithMinusI = 0
verbose = 0
for option, value in options:
	if option in ("-t", "-x"):
		compileWithMinusI = 1
		dumpOptions.extend((option, value))
	elif option == "-v":
		verbose = 1
	else:
		dumpOptions.extend((option, value))

dumpOptions = " ".join(dumpOptions)
if dumpOptions:
	dumpOptions = dumpOptions + " "

report = open("report.txt", "a+")


for ttFile in args:
	print "--- roundtripping %s ---" % ttFile
	fn = os.path.basename(ttFile)
	xmlFile1 = tempfile.mktemp(".%s.ttx1" % fn)
	ttFile2 = tempfile.mktemp(".%s" % fn)
	xmlFile2 = tempfile.mktemp(".%s.ttx2" % fn)
	
	try:
		cmd = 'ttdump -f %s"%s" "%s"' % (dumpOptions, ttFile, xmlFile1)
		doCommand(cmd, verbose)
		if compileWithMinusI:
			cmd = 'ttcompile -f -i "%s" "%s" "%s"' % (ttFile, xmlFile1, ttFile2)
		else:
			cmd = 'ttcompile -f "%s" "%s"' % (xmlFile1, ttFile2)
		doCommand(cmd, verbose)
		cmd = 'ttdump -f %s"%s" "%s"' % (dumpOptions, ttFile2, xmlFile2)
		doCommand(cmd, verbose)
		cmd = 'diff -c2 -I ".*modified value\|checkSumAdjustment.*" "%s" "%s"' % (xmlFile1, xmlFile2)
		diff = doCommand(cmd, 1, okresult=1)
		if diff:
			report.write("=============================================================\n")
			report.write("%s\n" % xmlFile1)
			report.write("%s\n" % xmlFile2)
			report.write("-------------------------------------------------------------\n")
			report.write(diff)
		print "--- done ---"
	except Error, why:
		report.write("=============================================================\n")
		report.write("%s\n" % ttFile)
		report.write("*** round tripping aborted (code %s) ***\n" % why)
		report.write("-------------------------------------------------------------\n")
		print "*** round tripping aborted (code %s) ***" % why
	for tmpFile in (xmlFile1, ttFile2, xmlFile2):
		if os.path.exists(tmpFile):
			os.remove(tmpFile)